I'm with AT&T and have a Blackjack II. So far it's been a great little phone. Stereo blue tooth, GPS, email, ect. I did upgrade the firmware to 6.1, not much difference except the phone locks onto satellites a lot faster. Dropped it a couple of times, use it outdoor in the heat and cold, rain ect, hasn't locked up once.

If I were to get another phone right now I'd like to look at the HTC Fuze, or some of the new Samsung phones, based on how well mine has preformed.